Federal Register / Vol. 88, No. 233 / Wednesday, December 6, 2023 / Proposed Rules 84761 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA proposes to amend 14 CFR part 

39 as follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

Rolls-Royce Deutschland Ltd & Co KG: 

Docket No. FAA–2023–2233; Project 

Identifier MCAI–2023–00755–E. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by January 22, 

2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Rolls-Royce 

Deutschland Ltd & Co KG Model Trent 1000– 

AE3, Trent 1000–CE3, Trent 1000–D3, Trent 

1000–G3, Trent 1000–H3, Trent 1000–J3, 

Trent 1000–K3, Trent 1000–L3, Trent 1000– 

M3, Trent 1000–N3, Trent 1000–P3, Trent 

1000–Q3, and Trent 1000–R3 engines. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7300, Engine Fuel and Control. 

(e) Unsafe Condition 

This AD was prompted by reports of wear 

in the combining spill-valve assembly of 

certain hydro-mechanical units. The FAA is 

issuing this AD to prevent thrust reduction. 

The unsafe condition, if not addressed, could 

result in reduced control of the airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

Except as specified in paragraph (h) of this 

AD: Perform all required actions within the 

compliance times specified in, and in 

accordance with, European Union Aviation 

Safety Agency (EASA) AD 2023–0119, dated 

June 12, 2023 (EASA AD 2023–0119). 

(h) Exceptions to EASA AD 2023–0119 

(1) Where EASA AD 2023–0119 requires 

compliance from its effective date, this AD 

requires using the effective date of this AD. 

(2) Where Table 1 of EASA AD 2023–0119 

specifies ‘‘26 June 2023;’’ replace that text 

with ‘‘As of the effective date of this AD.’’ 

(3) Where Table 1 of EASA AD 2023–0119 

specifies ‘‘01 October 2024;’’ replace that text 

with ‘‘Within 4 months after the effective 

date of this AD or October 1, 2024, whichever 

occurs later.’’ 

(4) Where the service information 

referenced in EASA AD 2023–0019 specifies 

to discard certain parts, this AD requires 

those parts to be removed from service. 

(5) This AD does not adopt the Remarks 

paragraph of EASA AD 2023–0119. 

(i) Definitions 

For the purposes of this AD, the 

‘‘implementation date’’ is defined as the date 

the applicable engine flight hours (EFH) limit 

takes effect. 

(j) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, AIR–520 Continued 

Operational Safety Branch, FAA, has the 

authority to approve AMOCs for this AD, if 

requested using the procedures found in 14 

CFR 39.19. In accordance with 14 CFR 39.19, 

send your request to your principal inspector 

or local Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the AIR–520 Continued 

Operational Safety Branch, send it to the 

attention of the person identified in 

paragraph (k) of this AD and email to: ANEAD-AMOC@faa.gov. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the local flight standards district office/ 

certificate holding district office. 

(k) Additional Information 

For more information about this AD, 

contact Sungmo Cho, Aviation Safety 

Engineer, FAA, 2200 South 216th Street, Des 

Moines, WA 98198; phone: (781) 238–7241; 

email: sungmo.d.cho@faa.gov. 

(l) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference of 

the service information listed in this 

paragraph under 5 U.S.C. 552(a) and 1 CFR 

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless the AD specifies otherwise. 

(i) European Union Aviation Safety Agency 

(EASA) AD 2023–0119, dated June 12, 2023. 

(ii) [Reserved] 

(3) For the EASA AD, contact EASA, 

Konrad-Adenauer-Ufer 3, 50668 Cologne, 

Germany; phone: +49 221 8999 000; email: 

ADs@easa.europa.eu. You may find EASA 

AD 2023–0119 on the EASA website at 

ad.easa.europa.eu. 

(4) You may view this service information 

at the FAA, Airworthiness Products Section, 

Operational Safety Branch, 1200 District 

Avenue, Burlington, MA 01803. For 

information on the availability of this 

material at the FAA, call (817) 222–5110. 

(5) You may view this material at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

visit www.archives.gov/federal-register/cfr/ 

ibr-locations or email fr.inspection@nara.gov. 

Issued on November 29, 2023. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–26649 Filed 12–5–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–2232; Project 

Identifier AD–2023–00943–R] 

RIN 2120–AA64 

Airworthiness Directives; Robinson 

Helicopter Company Helicopters 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

certain Robinson Helicopter Company 

Model R22, R22 Alpha, R22 Beta, R22 

Mariner, R44, R44 II, and R66 

helicopters. This proposed AD was 

prompted by reports of helicopters 

losing a tail rotor blade (TRB) tip cap. 

This proposed AD would require 

visually checking and inspecting certain 

part-numbered and serial-numbered 

TRB tip caps for evidence of corrosion 

and, depending on the results, removing 

the corrosion. This proposed AD would 

also require removing all affected TRBs 

from service and prohibit installing 

them on any helicopter. The FAA is 

proposing this AD to address the unsafe 

condition on these products. 

DATES: The FAA must receive comments 

on this proposed AD by January 22, 

2024. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

regulations.gov. Follow the instructions 

for submitting comments. 

• Fax: (202) 493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–2232; or in person at 

Docket Operations between 9 a.m. and 


lotter on DSK11XQN23PROD with PROPOSALS1
84762 Federal Register / Vol. 88, No. 233 / Wednesday, December 6, 2023 / Proposed Rules 

5 p.m., Monday through Friday, except 

Federal holidays. The AD docket 

contains this NPRM, any comments 

received, and other information. The 

street address for Docket Operations is 

listed above. 

• For service information identified 

in this NPRM, contact Robinson 

Helicopter Company, Technical Support 

Department, 2901 Airport Drive, 

Torrance, CA 90505; phone (310) 539– 

0508; fax (310) 539–5198; email ts1@

robinsonheli.com; or at 

robinsonheli.com. You may view this 

service information at the FAA, Office 

of the Regional Counsel, Southwest 

Region, 10101 Hillwood Parkway, Room 

6N–321, Fort Worth, TX 76177. For 

information on the availability of this 

material at the FAA, call (817) 222– 

5110. 

FOR FURTHER INFORMATION CONTACT: 

James Guo, Aviation Safety Engineer, 

FAA, 3960 Paramount Boulevard, 

Lakewood, CA 90712; phone: (562) 627– 

5357; email: james.guo@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

The FAA invites you to send any 

written relevant data, views, or 

arguments about this proposal. Send 

your comments to an address listed 

under ADDRESSES. Include ‘‘Docket No. 

FAA–2023–2232; Project Identifier AD– 

2023–00943–R’’ at the beginning of your 

comments. The most helpful comments 

reference a specific portion of the 

proposal, explain the reason for any 

recommended change, and include 

supporting data. The FAA will consider 

all comments received by the closing 

date and may amend this proposal 

because of those comments. 

Except for Confidential Business 

Information (CBI) as described in the 

following paragraph, and other 

information as described in 14 CFR 

11.35, the FAA will post all comments 

received, without change, to 

regulations.gov, including any personal 

information you provide. The agency 

will also post a report summarizing each 

substantive verbal contact received 

about this NPRM. 

Confidential Business Information 

CBI is commercial or financial 

information that is both customarily and 

actually treated as private by its owner. 

Under the Freedom of Information Act 

(FOIA) (5 U.S.C. 552), CBI is exempt 

from public disclosure. If your 

comments responsive to this NPRM 

contain commercial or financial 

information that is customarily treated 

as private, that you actually treat as 

private, and that is relevant or 

responsive to this NPRM, it is important 

that you clearly designate the submitted 

comments as CBI. Please mark each 

page of your submission containing CBI 

as ‘‘PROPIN.’’ The FAA will treat such 

marked submissions as confidential 

under the FOIA, and they will not be 

placed in the public docket of this 

NPRM. Submissions containing CBI 

should be sent to James Guo, Aviation 

Safety Engineer, FAA, 3960 Paramount 

Boulevard, Lakewood, CA 90712; 

phone: (562) 627–5357; email: 

james.guo@faa.gov. Any commentary 

that the FAA receives which is not 

specifically designated as CBI will be 

placed in the public docket for this 

rulemaking. 

Background 

The FAA has received three reports of 

TRB tip caps coming loose due to 

corrosion at the bond on Robinson 

Helicopter Company Model R44 

helicopters. Due to the similarity of the 

TRB tip caps on Robinson Helicopter 

Company Model R22, R22 Alpha, R22 

Beta, R22 Mariner, R44 II, and R66 

helicopters, those model helicopters are 

also affected by this issue. According to 

Robinson Helicopter Company, it has 

also seen TRBs that have corroded to an 

unserviceable condition, including 

severe leading edge pitting and 

degradation of the bond at the tip cap. 

Robinson Helicopter Company advises 

that helicopters operating near saltwater 

are particularly susceptible to corrosion, 

especially if stored outdoors. Affected 

TRBs were factory-installed or shipped 

as spares prior to November 2022. The 

three reports include a TRB tip cap 

departing its helicopter. The separate 

incidents occurred during a run-up 

check, after landing, and during a 

landing on different helicopters. 

Accordingly, this proposed AD would 

require repetitively checking and 

inspecting the tips caps of TRB part 

number (P/N) A029–2 with TRB serial 

numbers (S/N) up to 11279 inclusive (P/ 

N A029–2 REV A through U inclusive), 

TRB P/N C029–3 with TRB S/N up to 

14329 inclusive (P/N C029–3 REV A 

through Q inclusive), and TRB P/N 

F029–1 with TRB S/N up to 3099 

inclusive (P/N F029–1 REV A through F 

inclusive) for evidence of corrosion, 

removing corrosion, and eventual 

removal of those TRBs from service. 

A debonded TRB tip cap can cause 

severe vibration and possible failure of 

the tail rotor gearbox housing. This 

condition, if not addressed, could result 

in increased vibrations, reduced 

controllability, and subsequent loss of 

control of the helicopter. 

FAA’s Determination 

The FAA is issuing this NPRM after 

determining that the unsafe condition 

described previously is likely to exist or 

develop on other products of the same 

type designs. 

Related Service Information 

The FAA reviewed Robinson 

Helicopter Company R22 Service 

Bulletin SB–120, R44 Service Bulletin 

SB–112, and R66 Service Bulletin SB– 

41, each dated December 22, 2022 (SB– 

120, SB–112, and SB–41). This service 

information specifies procedures for 

revising the Pilot’s Operating Handbook 

of affected helicopters by inserting the 

included ‘‘Special Tail Rotor Tip 

Preflight Inspection’’ page and briefing 

all pilots and maintenance personnel 

regarding those inspection procedures. 

This service information also specifies 

procedures for replacing, and returning 

or sending photos of affected TRBs to 

Robinson Helicopter Company. 

The FAA also reviewed Robinson 

Helicopter Company R22 Service Letter 

SL–93, R44 Service Letter SL–82, and 

R66 Service Letter SL–40, each dated 

June 30, 2021 (co-published as one 

document) (SL–93, SL–82, and SL–40). 

This service information specifies 

procedures for removing corrosion from 

TRBs, applying protectant, balancing 

TRBs after corrosion removal or 

painting, chemical cleaning TRBs, and 

tap testing the TRB tip cap area. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

visually checking the TRB tip cap area 

of certain part-numbered and serialnumbered TRBs for an exposed tip cap 

bond line or bubbled paint, repetitively 

inspecting those TRBs for evidence of 

corrosion and, depending on the results, 

removing the corrosion. The owner/ 

operator (pilot) holding at least a private 

pilot certificate may check the TRB tip 

caps for an exposed tip cap bond line or 

bubbled paint and must enter 

compliance with the applicable 

paragraph of the proposed AD into the 

helicopter maintenance records in 

accordance with 14 CFR 43.9(a) and 

91.417(a)(2)(v). The pilot may perform 

this action because it only involves 

visually checking the TRB tip caps for 

an exposed tip cap bond line or bubbled 

paint. This action could be performed 

equally well by a pilot or a mechanic. 

This is an exception to the FAA’s 

standard maintenance regulations. 

This proposed AD would also require 

removing those TRBs from service 

within 10 months and prohibit 

installing them on any helicopter as of 

that date. 


lotter on DSK11XQN23PROD with PROPOSALS1
Federal Register / Vol. 88, No. 233 / Wednesday, December 6, 2023 / Proposed Rules 84763 

Differences Between This Proposed AD 

and the Service Information 

The effectivity of Robinson Helicopter 

Company SB–120, SB–112, and SB–41 

identify the helicopter S/Ns that the 

affected TRBs were factory-installed on 

and the shipping dates of affected TRB 

spares, whereas this proposed AD 

would apply to the specified model 

helicopters with certain part-numbered 

and serial-numbered TRBs installed. 

Robinson Helicopter Company SB–120, 

SB–112, and SB–41 specify revising the 

Pilot’s Operating Handbook of affected 

helicopters and briefing all pilots and 

maintenance personnel regarding the 

inspection requirements, whereas this 

proposed AD would not require those 

actions. Robinson Helicopter Company 

SB–120, SB–112, and SB–41 do not 

specify any visual inspections 

accomplished by a mechanic, whereas 

this proposed AD would require 

repetitive visual inspections of the TRBs 

by persons authorized under 14 CFR 

43.3. Robinson Helicopter Company 

SB–120, SB–112, and SB–41 specify 

replacing, and returning or sending 

photos of affected TRBs by December 

31, 2024, whereas this proposed AD 

would require removing affected TRBs 

from service within 10 months. 

SL–93, SL–82, and SL–40 specify 

procedures for chemical cleaning TRBs, 

tap testing the TRB tip care area, 

applying protectant, and balancing 

TRBs after corrosion removal or 

painting, whereas this proposed AD 

would not require those actions. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 2,701 

helicopters of U.S. registry. The FAA 

estimates the following costs to comply 

with this proposed AD. Labor costs are 

estimated at $85 per work-hour. 

Visually checking or inspecting the 

TRBs (up to two affected TRBs per 

helicopter) would take about 0.25 workhour for an estimated cost of up to $22 

per helicopter per check cycle, for a U.S 

fleet cost of up to $59,422 per check 

cycle. If required, removing any 

corrosion would take about 2 workhours and parts would cost about $100 

for an estimated cost of $270 per TRB. 

Replacing a TRB would take about 3.5 

work-hours and parts would cost up to 

about $3,600 for an estimated cost of up 

to $3,898 per TRB. 

The FAA has included all known 

costs in its cost estimate. According to 

the manufacturer, however, some of the 

costs of this proposed AD may be 

covered under warranty, thereby 

reducing the cost impact on affected 

operators. 

Authority for This Rulemaking 

Title 49 of the United States Code 

specifies the FAA’s authority to issue 

rules on aviation safety. Subtitle I, 

section 106, describes the authority of 

the FAA Administrator. Subtitle VII: 

Aviation Programs, describes in more 

detail the scope of the Agency’s 

authority. 

The FAA is issuing this rulemaking 

under the authority described in 

Subtitle VII, Part A, Subpart III, Section 

44701: General requirements. Under 

that section, Congress charges the FAA 

with promoting safe flight of civil 

aircraft in air commerce by prescribing 

regulations for practices, methods, and 

procedures the Administrator finds 

necessary for safety in air commerce. 

This regulation is within the scope of 

that authority because it addresses an 

unsafe condition that is likely to exist or 

develop on products identified in this 

rulemaking action. 

Regulatory Findings 

The FAA determined that this 

proposed AD would not have federalism 

implications under Executive Order 

13132. This proposed AD would not 

have a substantial direct effect on the 

States, on the relationship between the 

national government and the States, or 

on the distribution of power and 

responsibilities among the various 

levels of government. 

For the reasons discussed above, I 

certify this proposed regulation: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Would not affect intrastate 

aviation in Alaska, and 

(3) Would not have a significant 

economic impact, positive or negative, 

on a substantial number of small entities 

under the criteria of the Regulatory 

Flexibility Act. 

List of Subjects in 14 CFR Part 39 

Air transportation, Aircraft, Aviation 

safety, Incorporation by reference, 

Safety. 

The Proposed Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA proposes to amend 14 CFR part 

39 as follows: 

PART 39—AIRWORTHINESS 

DIRECTIVES 

■ 1. The authority citation for part 39 

continues to read as follows: 

Authority: 49 U.S.C. 106(g), 40113, 44701. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

Robinson Helicopter Company: Docket No. 

FAA–2023–2232; Project Identifier AD– 

2023–00943–R. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by January 22, 

2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to the Robinson 

Helicopter Company helicopters, certificated 

in any category, identified in paragraphs 

(c)(1) through (3) of this AD. 

(1) Model R22, R22 Alpha, R22 Beta, and 

R22 Mariner helicopters with tail rotor blade 

(TRB) part number (P/N) A029–2 with TRB 

serial numbers (S/N) up to 11279 inclusive 

(P/N A029–2 REV A through U inclusive), 

installed; 

(2) Model R44 and R44 II helicopters with 

TRB P/N C029–3 with TRB S/N up to 14329 

inclusive (P/N C029–3 REV A through Q 

inclusive), installed; and 

(3) Model R66 helicopters with TRB P/N 

F029–1 with TRB S/N up to 3099 inclusive 

(P/N F029–1 REV A through F inclusive), 

installed. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 6410, Tail Rotor Blades. 

(e) Unsafe Condition 

This AD was prompted by reports of 

helicopters losing a TRB tip cap. The FAA is 

issuing this AD to detect and prevent TRB tip 

cap failures. The unsafe condition, if not 

addressed, could result in increased 

vibrations, reduced controllability, and 

subsequent loss of control of the helicopter. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(1) Within 10 hours time-in-service (TIS) 

after the effective date of this AD and 

thereafter before the first flight of each day, 

visually check each TRB tip cap area (at and 

adjacent to the tip cap bond line on each 

surface and edge of the TRB) for an exposed 

tip cap bond line or bubbled paint, as 

depicted in Figure 1 of paragraph (g)(1) of 

this AD. These items may indicate evidence 

of corrosion. The owner/operator (pilot) 

holding at least a private pilot certificate may 

accomplish this TRB tip cap check and must 

enter compliance with this paragraph of the 

AD into the helicopter maintenance records 

in accordance with 14 CFR 43.9(a) and 

91.417(a)(2)(v). The record must be 

maintained as required by 14 CFR 91.417, 

121.380, or 135.439. 


lotter on DSK11XQN23PROD with PROPOSALS1
84764 Federal Register / Vol. 88, No. 233 / Wednesday, December 6, 2023 / Proposed Rules 

Figure 1 to Paragraph (g)(1)—TRB Tip Cap 

Check/Inspection 

(2) Within 100 hours TIS or during the next 

100 hour or annual inspection after the 

effective date of this AD, whichever occurs 

first, and thereafter at intervals not to exceed 

100 hours TIS or during the next 100 hour 

or annual inspection, whichever occurs first, 

visually inspect each TRB tip cap area (at and 

adjacent to the tip cap bond line on each 

surface and edge of the TRB) for evidence of 

corrosion, which may be indicated by an 

exposed tip cap bond line or bubbled paint, 

as depicted in Figure 1 of paragraph (g)(1) of 

this AD. 

(3) As a result of the actions required by 

either paragraph (g)(1) or (2) of this AD, if 

there is evidence of corrosion, an exposed tip 

cap bond line, or bubbled paint, before 

further flight, remove all of the corrosion. 

Note 1 to paragraph (g)(3): Robinson 

Helicopter Company R22 Service Letter SL– 

93, R44 Service Letter SL–82, and R66 

Service Letter SL–40, each dated June 30, 

2021 (co-published as one document), 

provide information regarding removing 

corrosion from TRBs. 

(4) Within 10 months of the effective date 

of this AD, remove all TRBs identified in 

paragraph (c) of this AD from service. 

(5) As of 10 months after the effective date 

of this AD, do not install a TRB identified in 

paragraph (c) of this AD on any helicopter. 

(h) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, West Certification 

Branch, FAA, has the authority to approve 

AMOCs for this AD, if requested using the 

procedures found in 14 CFR 39.19. In 

accordance with 14 CFR 39.19, send your 

request to your principal inspector or local 

Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the West Certification 

Branch, send it to the attention of the person 

identified in paragraph (i)(1) of this AD. 

Information may be emailed to: 9-ANMLAACO-AMOC-REQUESTS@faa.gov. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the local flight standards district office/ 

certificate holding district office. 

(i) Additional Information 

(1) For more information about this AD, 

contact James Guo, Aviation Safety Engineer, 

FAA, 3960 Paramount Boulevard, Lakewood, 

CA 90712; phone: (562) 627–5357; email: 

james.guo@faa.gov. 

(2) For service information identified in 

this AD that is not incorporated by reference, 

contact Robinson Helicopter Company, 

Technical Support Department, 2901 Airport 

Drive, Torrance, CA 90505; phone (310) 539– 

0508; fax (310) 539–5198; email ts1@

robinsonheli.com; or at robinsonheli.com. 

You may view this service information at the 

FAA, Office of the Regional Counsel, 

Southwest Region, 10101 Hillwood Parkway, 

Room 6N–321, Fort Worth, TX 76177. For 

information on the availability of this 

material at the FAA, call (817) 222–5110. 

(j) Material Incorporated by Reference 

None. 

Issued on November 29, 2023. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2023–26744 Filed 12–5–23; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–2230; Project 

Identifier MCAI–2023–00861–T] 

RIN 2120–AA64 

Airworthiness Directives; Deutsche 

Aircraft GmbH (Type Certificate 

Previously Held by 328 Support 

Services GmbH; AvCraft Aerospace 

GmbH; Fairchild Dornier GmbH; 

Dornier Luftfahrt GmbH) Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for all 

Deutsche Aircraft GmbH Model 328–100 

and –300 airplanes. This proposed AD 

was prompted by operator reports of 

worn and ruptured bonding straps 

inside the feeder wing tanks and in both 

outer and inner wing tanks. This 

proposed AD would require a one-time 

detailed inspection of each affected part, 

and applicable corrective actions, as 

specified in a European Union Aviation 

Safety Agency (EASA) AD, which is 

proposed for incorporation by reference 

(IBR). The FAA is proposing this AD to 

address the unsafe condition on these 

products. 

DATES: The FAA must receive comments 

on this proposed AD by January 22, 

2024. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 


lotter on DSK11XQN23PROD with PROPOSALS1EP06DE23.084</GPH>

Example: Erosion, 

exposed bond line 

Example: 81.1bbled 

paint (indicates 

underlying corrosion) 

•fa!,,_~ - - = 

Tip cap bond lme 

Tip cap bond 

line 0,30 inches 

from tip